Taxonomic notes on Thrixspermum (Orchidaceae: Aeridinae), with five new species from Thailand Author Toolmal, Nopparut 0009-0001-4886-7477 Royal Botanic Gardens, Kew, Richmond, TW 9 3 AE, United Kingdom & Herbarium, School of Biological Sciences, University of Reading, Whiteknights, Reading, Berkshire, RG 6 6 EX, United Kingdom & Thai Traditional Medicine Herbarium (TTM), 693 Bamrung Muang Rd., Pom Prap Sattru Phai, Bangkok 10100, Thailand & n. toolmal @ kew. org, n. toolmal @ pgr. reading. ac. uk; https: // orcid. org / 0009 - 0001 - 4886 - 7477 n.toolmal@pgr.reading.ac.uk Author Suddee, Somran 0000-0003-4031-9721 Forest Herbarium (BKF), Department of National Parks, Wildlife and Plant Conservation, 61 Phahonyothin Road, Chatuchak, Bangkok 10900, Thailand & somrans @ hotmail. com; https: // orcid. org / 0000 - 0003 - 4031 - 9721 somrans@hotmail.com Author Culham, Alastair 0000-0002-7440-0133 Herbarium, School of Biological Sciences, University of Reading, Whiteknights, Reading, Berkshire, RG 6 6 EX, United Kingdom & a. culham @ reading. ac. uk; https: // orcid. org / 0000 - 0002 - 7440 - 0133 a.culham@reading.ac.uk Author Utteridge, Timothy M. A. 0000-0003-2823-0337 Royal Botanic Gardens, Kew, Richmond, TW 9 3 AE, United Kingdom & t. utteridge @ kew. org; https: // orcid. org / 0000 - 0003 - 2823 - 0337 t.utteridge@kew.org Author Schuiteman, André 0000-0001-6701-8158 Royal Botanic Gardens, Kew, Richmond, TW 9 3 AE, United Kingdom & a. schuiteman @ kew. org; https: // orcid. org / 0000 - 0001 - 6701 - 8158 a.schuiteman@kew.org text Phytotaxa 2023 2023-07-11 601 3 223 262 http://dx.doi.org/10.11646/phytotaxa.601.3.3 journal article 53840 10.11646/phytotaxa.601.3.3 891014bc-6b64-4705-9fec-bd35af7b209c 1179-3163 8141764

TABLE 1. Previously recorded species of the genus Thrixspermum (Orchidaceae) in Thailand (not including T. musciflorum auct. non A.S. Rao & J. Joseph: Seidenf. = T. alboluteum; see text)

No.	Scientific names	Sections	References
1	T. acuminatissimum (Blume) Rchb.f.	Thrixspermum	Reichenbach 1862: 121
2	T. amplexicaule (Blume) Rchb.f.	Thrixspermum	Reichenbach 1862: 121
3	T. calceolus (Lindl.) Rchb.f.	Thrixspermum	Reichenbach 1862: 122
4	T. centipeda Lour.	Thrixspermum	Loureiro 1790: 520
5	T. leucarachne Ridl.	Thrixspermum	Ridley 1896: 397
6	T. obyrneanum Toolmal, P.T.Ong & Schuit.	Thrixspermum	Toolmal et al. 2022: 155
7	T. scopa (Rchb.f. ex Hook.f.) Holttum	Thrixspermum	Holttum 1947: 289
8	T. sutepense (Rolfe ex Downie) Tang & F.T.Wang	Thrixspermum	Tang & F.T. Wang 1951: 92
9	T. ancoriferum (Guillaumin) Garay	Dendrocolla	Smith 1905: 577, Garay 1972: 206
10	T. annamense (Guillaumin) Garay	Dendrocolla	Garay 1972: 206
11	T. clavatum (J.Koenig) Garay	Dendrocolla	Garay 1972: 207 (as T. ridleyanum Schltr. 1911: 57) in Seidenfaden 1988: 161
12	T. merguense (Hook.f.) Kuntze	Dendrocolla	Kuntze 1891: 682
13	T. recurvum (Hook.f.) Kuntze	Dendrocolla	Kuntze 1891: 682
14	T. trichoglottis (Hook.f.) Kuntze	Dendrocolla	Kuntze 1891: 682
15	T. pensile Schltr.	Katocolla	Schlechter 1911: 54 & 59